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  1. #include <iostream>
  2. #include <map>
  3. #include <functional>
  4. #include <string>
  5.  
  6. using namespace std;
  7.  
  8. void f_1234() { cout << "1234\n"; }
  9.  
  10. void f_ABCD() { cout << "ABCD\n"; }
  11.  
  12. void f_default() { cout << "default\n"; }
  13.  
  14. void f( const char* s )
  15. {
  16.   using function_t = std::function< void() >;
  17.   using string_to_function = map< string, function_t >;
  18.  
  19.   static string_to_function m =
  20.   {
  21.     {"1234", f_1234}, // assosciate "1234" to function f_1234
  22.     {"ABCD", f_ABCD}, // assosciate "ABCD" to function f_ABCD
  23.   };
  24.  
  25.   auto i = m.find( s );
  26.  
  27.   return i == m.end()
  28.     ? f_default() // not found in map
  29.     : i->second(); // found, so we call the function
  30. }
  31.  
  32. int main()
  33. {
  34.   f( "1234" );
  35.   f( "ABCD" );
  36. }
  37.  
Success #stdin #stdout 0s 4340KB
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stdin
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Standard input is empty
stdout
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1234
ABCD
https://ideone.com/wPCEiv
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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